CVE-2026-55967: wolfSSL

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.

Affected products

• wolfSSL wolfSSL: from 4.8.0, before 5.9.2 (fixed in 5.9.2)

Published 2026-06-25. Last modified 2026-06-26.